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(#) App Link warning

!!! WARNING: App Link warning
   This is a warning.

Id
:   `AppLinkWarning`
Summary
:   App Link warning
Severity
:   Warning
Category
:   Correctness
Platform
:   Android
Vendor
:   Android Open Source Project
Feedback
:   https://issuetracker.google.com/issues/new?component=192708
Since
:   8.8.0 (January 2025)
Affects
:   Manifest files
Editing
:   This check runs on the fly in the IDE editor
See
:   https://developer.android.com/training/app-links
See
:   https://g.co/AppIndexing/AndroidStudio
Implementation
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/AppLinksValidDetector.kt)
Tests
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/AppLinksValidDetectorTest.kt)

From Android 12, intent filters that use the HTTP and HTTPS schemes will
no longer               bring the user to your app when the user clicks
a link, unless the intent filter is               an Android App Link.
Such intent filters must include certain elements, and at least
     one Android App Link for each domain must have
`android:autoVerify="true"` to verify               ownership of the
domain. We recommend adding `android:autoVerify="true"` to any intent
           filter that is intended to be an App Link, in case the other
App Links are modified.

!!! Tip
   This lint check has an associated quickfix available in the IDE.

(##) Example

Here is an example of lint warnings produced by this check:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text
AndroidManifest.xml:6:Warning: This intent filter has the format of an
Android App Link but is missing the autoVerify attribute; add
android:autoVerify="true" to ensure your domain will be validated and
enable App Link-related Lint warnings. If you do not want clicked URLs
to bring the user to your app, remove the
android.intent.category.BROWSABLE category, or set
android:autoVerify="false" to make it clear this is not intended to be
an Android App Link. [AppLinkWarning]
    &lt;intent-filter&gt; &lt;!-- We expect a warning here --&gt;
     -------------
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here is the source file referenced above:

`AndroidManifest.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.helloworld" &gt;

    &lt;application&gt;
        &lt;activity android:name=".FullscreenActivity"&gt;
            &lt;intent-filter&gt; &lt;!-- We expect a warning here --&gt;
                &lt;action android:name="android.intent.action.VIEW" /&gt;
                &lt;category android:name="android.intent.category.DEFAULT" /&gt;
                &lt;category android:name="android.intent.category.BROWSABLE" /&gt;

                &lt;data android:scheme="http" /&gt;
                &lt;data android:scheme="https" /&gt;

                &lt;data android:host="example.com" /&gt;
                &lt;data android:pathPrefix="/gizmos" /&gt;
            &lt;/intent-filter&gt;

            &lt;intent-filter&gt; &lt;!-- Missing VIEW --&gt;
                &lt;category android:name="android.intent.category.DEFAULT" /&gt;
                &lt;category android:name="android.intent.category.BROWSABLE" /&gt;

                &lt;data android:scheme="http" /&gt;
                &lt;data android:scheme="https" /&gt;

                &lt;data android:host="example.com" /&gt;
                &lt;data android:pathPrefix="/gizmos" /&gt;
            &lt;/intent-filter&gt;

            &lt;intent-filter&gt; &lt;!-- Missing DEFAULT --&gt;
                &lt;action android:name="android.intent.action.VIEW" /&gt;
                &lt;category android:name="android.intent.category.BROWSABLE" /&gt;

                &lt;data android:scheme="http" /&gt;
                &lt;data android:scheme="https" /&gt;

                &lt;data android:host="example.com" /&gt;
                &lt;data android:pathPrefix="/gizmos" /&gt;
            &lt;/intent-filter&gt;

            &lt;intent-filter&gt; &lt;!-- Missing BROWSABLE --&gt;
                &lt;action android:name="android.intent.action.VIEW" /&gt;
                &lt;category android:name="android.intent.category.DEFAULT" /&gt;

                &lt;data android:scheme="http" /&gt;
                &lt;data android:scheme="https" /&gt;

                &lt;data android:host="example.com" /&gt;
                &lt;data android:pathPrefix="/gizmos" /&gt;
            &lt;/intent-filter&gt;

            &lt;intent-filter&gt; &lt;!-- Has custom scheme, missing http --&gt;
                &lt;action android:name="android.intent.action.VIEW" /&gt;
                &lt;category android:name="android.intent.category.DEFAULT" /&gt;
                &lt;category android:name="android.intent.category.BROWSABLE" /&gt;

                &lt;data android:scheme="other" /&gt;

                &lt;data android:host="example.com" /&gt;
                &lt;data android:pathPrefix="/gizmos" /&gt;
            &lt;/intent-filter&gt;

            &lt;intent-filter&gt; &lt;!-- Has no scheme --&gt;
                &lt;action android:name="android.intent.action.VIEW" /&gt;
                &lt;category android:name="android.intent.category.DEFAULT" /&gt;
                &lt;category android:name="android.intent.category.BROWSABLE" /&gt;

                &lt;data android:host="example.com" /&gt;
                &lt;data android:pathPrefix="/gizmos" /&gt;
            &lt;/intent-filter&gt;

            &lt;intent-filter&gt; &lt;!-- Missing host --&gt;
                &lt;action android:name="android.intent.action.VIEW" /&gt;
                &lt;category android:name="android.intent.category.DEFAULT" /&gt;
                &lt;category android:name="android.intent.category.BROWSABLE" /&gt;

                &lt;data android:scheme="http" /&gt;
                &lt;data android:scheme="https" /&gt;
            &lt;/intent-filter&gt;

            &lt;intent-filter android:autoVerify="false"&gt; &lt;!-- We would usually expect a warning here, but it has autoVerify="false" --&gt;
                &lt;action android:name="android.intent.action.VIEW" /&gt;
                &lt;category android:name="android.intent.category.DEFAULT" /&gt;
                &lt;category android:name="android.intent.category.BROWSABLE" /&gt;

                &lt;data android:scheme="http" /&gt;
                &lt;data android:scheme="https" /&gt;

                &lt;data android:host="example.com" /&gt;
                &lt;data android:pathPrefix="/gizmos" /&gt;
            &lt;/intent-filter&gt;
        &lt;/activity&gt;
    &lt;/application&gt;
&lt;/manifest&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You can also visit the
[source code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/AppLinksValidDetectorTest.kt)
for the unit tests for this check to see additional scenarios.

The above example was automatically extracted from the first unit test
found for this lint check, `AppLinksValidDetector.testAddAutoVerifySuggestion`.
To report a problem with this extracted sample, visit
https://issuetracker.google.com/issues/new?component=192708.

(##) Suppressing

You can suppress false positives using one of the following mechanisms:

* Adding the suppression attribute `tools:ignore="AppLinkWarning"` on
  the problematic XML element (or one of its enclosing elements). You
  may also need to add the following namespace declaration on the root
  element in the XML file if it's not already there:
  `xmlns:tools="http://schemas.android.com/tools"`.

  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;manifest xmlns:tools="http://schemas.android.com/tools"&gt;
      ...
      &lt;activity tools:ignore="AppLinkWarning" .../&gt;
    ...
  &lt;/manifest&gt;
  ```

* Using a special `lint.xml` file in the source tree which turns off
  the check in that folder and any sub folder. A simple file might look
  like this:
  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;lint&gt;
      &lt;issue id="AppLinkWarning" severity="ignore" /&gt;
  &lt;/lint&gt;
  ```
  Instead of `ignore` you can also change the severity here, for
  example from `error` to `warning`. You can find additional
  documentation on how to filter issues by path, regular expression and
  so on
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/lintxml.md.html).

* In Gradle projects, using the DSL syntax to configure lint. For
  example, you can use something like
  ```gradle
  lintOptions {
      disable 'AppLinkWarning'
  }
  ```
  In Android projects this should be nested inside an `android { }`
  block.

* For manual invocations of `lint`, using the `--ignore` flag:
  ```
  $ lint --ignore AppLinkWarning ...`
  ```

* Last, but not least, using baselines, as discussed
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).

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